Boom mounted conveying means

ABSTRACT

Conveying means is mounted on an extensible boom of a wheeled vehicle in such manner that one end of the conveyor system is adapted to receive materials such as concrete or the like from a delivery truck and the other end is adapted to discharge the materials, as through a tremie, into a wall form or the like. The arrangement is such that the boom of the wheeled vehicle can be extended and retracted, inclined and swung from side to side during a continuous materials delivery operation so that the tremie can follow the outline of the wall form for evenly distributing the materials therein. The extension, elevation and wing of the boom can be effected by the operator without interrupting the flow of materials, and the form filling job can therefore be completed in a minimum of time.

United States Patent 72 1111161116: RobertF.Oury 2,968,382 1/1961 Oury193/16x ElrnburstJll. 3,003,611 10/1961 Pelzer. 198/88 21 APPLNO.778.242 3,439,700 4/1969 Preston 137/615X i E' f d 33 32: FOREIGNPATENTS aene ug.

- 1123 681 8/1968 GreatBntam 198/89 1 1 1 1 ml 626,773 3/1936 Germany198/89 [54] BOOM MOUNTED CONVEYING MEANS 14 Claims, 19 Drawing Figs.

Primary ExaminerRobert G. Sheridan Att0rney- Molinare, Allegretti,Newitt and Witcoff ABSTRACT: Conveying means is mounted on an extensibleboom of a wheeled vehicle in such manner that one end of the conveyorsystem is adapted to receive materials such as concrete or the like froma delivery truck and the other end is adapted to discharge thematerials, as through a tremie, into a wail form or the like. Thearrangement is such that the boom of the wheeled vehicle can be extendedand retracted, inclined and swung from side to side during a continuousmaterials delivery operation so that the tremie can follow the outlineof the wall form for evenly distributing the materials therein. Theextension, elevation and wing of the boom can be effected by theoperator without interrupting the flow of materials, and the formfilling job can therefore be completed in a minimum of timePATENTEDAUBIVOIQI:

sum 1 or 7 N .F w

PATENTEU AUG 1 0 MI SHEET 3 BF 7 B 0 er ur y fim m PATENTED AUG 1 0 I97!SHEET 5 OF 7 Wilma/LU Ways PATENTEU AUG 1 019m sum 7 or 7 iufenlorr f"Gary BOOM MOUNTED CONVEYING MEANS BACKGROUND OF THE INVENTION Variousconveyor arrangements have been provided for the purpose of placinggranular orplastic materials, and concrete or the like, such asdisclosed in prior Oury US. Pat. Nos. 3,Il,732, 3,I7l,534 and 3,203,538.Another conveyor arrangement is shown in my copending application, Ser.No. 735,004, filed June 6, I968. The presently disclosed conveyor systemis particularly adapted for mounting on a wheeled vehicle having anextensible boom which can also be elevated and swung from side to side,and the boom carries part of the conveyor system so that the dischargeend of the system can be adjusted by the operator of the vehicle tofollow a wall form or the like, and elevated as the materials accumulatewithout interrupting the continuous flow of concrete from a deliveryvehicle to the conveyor system and from the conveyor system to variouspositions of deposit.

One object of the invention therefore is to provide a design of conveyorsystem in which a lower conveyor is telescopically related to an upperconveyor and manipulated by the extensible boom, both conveyors beingmounted on the boom and a supply conveyor being related to the upperconveyor so as to supply materials thereto continuously withoutinterruption while the lower conveyor is being extended or retracted,and while the boom is being raised or lowered.

Another object is to provide a lower conveyor so mounted on anextensible boom that it can be extended and retracted with the boom, andadditionally extended and retracted relative to the boom for maximumrange of discharge end positioning.

Still another object is to provide a supply conveyor which is mounted oncastered wheels and discharges into a swivel hopper, which in turndischarges onto the upper conveyor of the system, the caster wheelspermitting positioning of the wheeled vehicle and thereafter swinging ofthe supply hopper to a suitable position for receiving materials from asupply vehicle.

A further object is to provide means for locking the caster wheelsagainst castering so that the wheeled vehicle can be driven from oneplace to another with the supply hopper trailing behind it, the casterwheels being then unlocked for swinging the supply hopper to anysuitable position for receiving materials.

Still a further object is to provide a swivel hopper mounted inalignment with the vertical axis on which the extensible boom swings,and an arrangement for readjusting the swivel hopper to align with thataxis following a change in inclination of the extensible boom and theconveyors carried thereby.

An additional object is to provide supporting means for the upper andlower conveyors on the extensible boom so arranged as to permit variousadjustments of the upper and lower conveyors in relation to each otherand counteract cantilever action of the lower conveyor by properlyadjusting the supporting means by extension or retraction of theextensible boom.

Another additional object is to provide track and roller connectionsbetween the upper and lower conveyors and between the extensibleportions of the boom and the conveyors to permit the various desiredextensible and retractable adjustments of the upper and lower conveyorsin relation to each other.

Still another additional object is to provide quickly disconnectableconnections between the conveyor system and the extensible boom of thewheeled vehicle so that the conveyor system can be removed by anothercrane or the like, and the wheeled vehicle and its extensible boomthereupon used in its normal capacity as a crane.

A further additional object is to provide automatic release means for atremie at the outer discharge end of the lower conveyor so that upon thetremie becoming overloaded such release can occur. I

Still a further additional object is to provide signal means and acircuit for stopping the conveyor system operable prior to automaticrelease of the tremie.

BRIEF SUMMARY OF THE INVENTION Upper and lower conveyors are mounted onan extensible boom of a wheeled vehicle, and a supply conveyor isassociated with the upper conveyor in such manner as to receive concreteor the like from a delivery vehicle and deliver it through a swivelhopper to the upper conveyor. The extensible boom and the system ofupper and lower conveyors can be extended, and/or elevated, and/orrotated for adjusting the discharge end of the lower conveyor to a wallform or the like wherein the concrete is placed, all withoutinterference with the continuous supply of concrete to the supplyconveyor. A warning and automatic release system is provided for atremie at the discharge end of the lower conveyor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a perspective view of myboom mounted conveying means showing it mounted on an extensible boom ofa wheeled vehicle, and illustrating a dump truck delivering materialsthereto, such materials being conveyed to a column form; FIG. 2 is anenlarged side elevation of the central portion of FIG. 1;

FIG. 2A is an enlarged vertical sectional view on the line 2A-2A of FIG.2;

FIG. 3 is a plan view ofa portion of FIG. 2;

FIG. 4 is a plan view of the central portion of my conveyor arrangement,being the outer end of the upper conveyor and the inner end of the lowerconveyor, and being a continuation of the right-hand end of FIG. 3; FIG.5 is a side elevation of FIG. 4 and is a continuation of the right-handend of FIG. 2',

FIG. 6 is an enlarged vertical cross-sectional view on the line 6-6 ofFIG. 5;

FIG. 6A is a detail vertical sectional view on the line 6A-6A of FIG. 5;

FIG. 7 is a plan view of the outer end of the lower conveyor, and is acontinuation of the right-hand end of FIG. 4;

FIG. 8 is a side elevation of FIG. 7 and is a continuation of theright-hand end of FIG. 5;

FIG. 8A is an enlarged vertical cross section on the line 8A-8A of FIG.8;

FIG. 9 is an enlarged vertical cross section on the line 9-9 of FIG. 7;

FIG. 10 is a vertical sectional view on the line 10-10 of FIG. 9 andincludes an electric circuit diagram for an overload condition andautomatic stopping means for my conveyor system;

FIG. 11 is a further enlarged horizontal cross section on the line lI-llof FIG. I0;

FIG. 12 (on Sheet 1) is an elevational detail ofa portion of FIG. Iwithin the circle I2 thereof;

FIG. 13 is a diagrammatic view of my upper and lower conveyors and theswivel hopper associated with the upper conveyor, all mounted on anextensible boom of a wheeled vehicle, and illustrates full extensionofthe conveyor arrangement;

FIG. I4 is a similar diagrammatic view showing intermediate extension;

FIG. I5 is a similar diagrammatic view showing minimum extensionthereof; and

FIG. I6 is a diagrammatic view similar to the left-hand end of FIG. 13showing an angular position of the boom and a readjusted position of aswivel hopper of any conveying means.

DESCRIPTION OF THE PREFERRED EMBODIMENT On the accompanying drawings Ihave used the following reference characters to indicate the majorelements of my invention, reserving reference numerals for thedescription of detailsof those elements:

BI--a First Boom Section ofa Wheeled Vehicle 82 and Bil-Second and ThirdBoom Sections HC Hydraulic Cylinder LC--Lwer Conveyor LS--Limit Switchfor MI, M2, M3 and Siren 146 MI--Motor for Supply Conveyor SC (omittedfrom FIG. 3)

M2-'Motor for Upper Conveyor UC M3--Motor for Lower Conveyor LCM4--Motor for telescoping the Lower Conveyor LC M5--Motor for traversingthe Swivel Hopper SH along Upper Conveyor UC M6--Motor for driving PumpP P--Pump to actuate Hydraulic Cylinder HC ODl--Quick Disconnect meansfor Support Sll QD2--Quick Disconnect means for Supporting means S2QD3--Quick Disconnect Means for Support S3 Sl--Support (on inner end ofBoom BI) for inner end of Upper Conveyor UC S2--Supporting means (onouter end of Boom B2) for outer end of Upper Conveyor UC and for LowerConveyor LC S3--Support (on outer end of Boom B3) for Lower Conveyor LCSC--Supply Conveyor SH--Swivel Hopper UC--Upper Conveyor WV--WheeledVehicle Describing now the details of the foregoing elements, andstarting with the wheeled vehicle WV shown in FIG. ll, this may be oneof the presentday types of hydraulically powered telescopic boom cranescomprising a body M provided with the usual four wheels 16 and withoutriggers 18 for stability. A boom supporting column 20 is rotatable ona vertical axis 22 (see FIGS. 1, 2 and I3l6) and the boom section B1 ispivoted thereto at 24 for change of angle as from the horizontalposition shown in FIGS. I and 2 to any desired elevated angularposition. Such angular elevation is effected by the hydraulic cylinderNC. A driver's cab 28 is mounted on the frame 14 in which there aresuitable controls (including a control panel 152-see FIG. I0) forrotation of the boom support ing column 20 and telescoping of the boomBI, B2, B3, as well as elevation of the boom and other driving controlsof well known nature and which accordingly I neither disclose nordescribe.

I provide conveying means for concrete or the like comprising theconveyors SC, UC and LC mounted on the boom Bl, B2, B3 in a manner whichwill now be described. Referring to FIG. 2, the support S1 comprises ayoke 30 secured by a quick disconnect means QDI to the column 20 asshown in FIG. 2A. By way of example, a platform 31 is secured to thecolumn 20 and is perforated to receive studs 33 welded to the horizontalcrossmember of the yoke 30, removable pins 35 being provided and securedby chains 39 to the platform 31 to prevent their loss. The upper ends ofthe arms of the yoke 30 are at tached to the inner end of a frame 34 ofthe upper conveyor UC. The upper conveyor frame 34 is actually a pair ofside frames (see FIG. 6), preferably of the extrusion type shown inFIGS. 7 and I] of my copending application hereinbefore referred to.

A conveyor belt 36 is trained around rollers 38 and 40 as shown in FIGS.2 and 5 respectively, and FIG. 2 shows the motor M2 for driving theroller 38 by means of a chain corineetion M, this type of drive beingalso shown in my copending application.

The conveyor belts 36 and 361: (see FIG. 6) are suitably troughed bymeans of idler rollers 37 and 37a (as also shown in my copendingapplication). A transfer hood 49 of rubber or the like mounted on abracket 47 directs conveyed materials from the discharge end of theupper conveyor UC to the lower conveyor LC (see also FIGS. 4 and 5).

The support S2 is of special three-part design comprising three brackets42, 44 and 416 for each side of the upper and lower conveyors UC and LCas shown in FIGS. 4 and 5. The brackets 42 are the arms of a yokesecured to the outer end of the boom section B2 and terminate at theirupper ends in wheels 48. The quick disconnect means ODZ for the bracket42 as illustrated in FIG. 6 for connecting the bracket in quickdisconnect manner to the boom B2. The quick disconnect means QD2 issimilar to QDll shown in FIG. 2A and is illustrated in FIG. 6, certainparts being substantially the same as in FIG. 2 and bearing the samereference numerals with the addition of the distinguishingcharacteristic a(3la, 33a, 35a and 39a).

The brackets 44 are secured at their upper ends to the outer end of theupper conveyor UC and terminate at their lower ends in wheels 50.Conversely the brackets 46 are secured, as by welding at their lowerends, to the inner end of the lower conveyor LC and terminate at theirupper ends in wheels 52. The wheels 52 travel in tracks of the frame 34of the upper conveyor UC, which are identified (upper and lower surfacesthereof) as 54 and 56 in FIG. 6.

Similarly, as shown in FIG. 6, the lower conveyor is provided with sideframes 34a which have tracks 54a, 56a in which the wheels 48 and 50travel. The triple bracket arrange ment 12, Ml, 46 of the support S2 isprovided to accommodate the three-section telescoping boom Bil, B2, B3of the wheeled vehicle WV and stabilize the inner end of the lowerconveyor LC by counteracting cantilever action thereof as willhereinafter appear. The lower conveyor LC is similar, as far as conveyorbelt, roller and drive motor are concerned, to the upper conveyor UC,having a belt 36a, rollers 38a and 40a and a drive chain tlla actuatedin this case by the motor M3.

The support S3 as shown in FIGS. 7, 8 and 8A comprises a yoke 58 securedto the outer end of the boom section B3 and includes the quickdisconnect means QD3. The quick discon nect means CD3 is similar tothose already described and comprises comparable elements identified31b, 33b, 35b and 39b. The upper ends of the yoke 58 terminate in wheels60 also coacting with the tracks 54a, 56a of a side frame 340 of thelower conveyor LC FIG. 8 also shows the usual crane cable 60 while FIG.I shows it and the hook 62 on the lower end thereof for use of the cranein its normal capacity when used alone, as when my boom mountedconveying means has been demounted therefrom. The cable and hook canalso be used while the conveyors are mounted on the boom.

The swivel hopper SH shown in FlGS. 1,2 and 3 is mounted on a framecomprising a pair of side members 64 and a crossmember 65 and providedwith four wheels 66, tow for travel in each of the tracks 54, 56 of theside frames 34 of the upper conveyor UC. The swivel hopper includes achute 68 having an annular or cylindrical upper portion 680 and a lowerdischarge portion 68!; as clearly shown in FIGS. 2 and 3 for receivingmaterials from the supply conveyor SC and discharging them onto theupper conveyor UC. The cylindrical portion 68b is supported by a pair oflinks 70 having lower pivots 72 to the side frames 64 and upper pivots74 to the cylindrical portion. Means is provided for adjusting therelative positions of the frame 64, 65 and the chute 68 longitudinallyof the upper conveyor UC comprising two of the hydraulic cylinders I-IC(one for each of the two links 70) which are pivoted at 76 to the frame64 and have piston rods 78 extending therefrom and pivoted at theirupper ends at 80 to the links 70. By reference to the vertical axis 22of the column 20 in FIG. 2 hereinbefore referred to, it will be notedthat the center of the cylindrical portion of the chute 68 is coincidentwith this axis. Both the position of the frame 64, 65 along the tracks54, 56, and the angularity of the links 70 for movement to the right orthe left of the axis 22 can be ad justed. Accordingly, when the angle ofelevation of the boom Bll, B2, B3 is changed and throws the axis of theswivel hopper SH off with relation to the vertical axis 22 from theposition illustrated in FIG. 2, adjustments can be made to bring theaxis of the swivel hopper back into coincidence with the axis 22 as inFIG. to so that the boom Bl, B2, B3 may be swung about the axis 22without disturbing the position of the swivel hopper and the supplyconveyor SC connected therewith. This permits uninterrupted delivery ofmaterials from the supply conveyor SC onto the upper conveyor U( eventhough the outer end of the boom is pivoted from aide to side fordistributing concrete along a darn mte or along a wall form or the like,and at the same time the extensible boom can be extended for followingany straight line (or any curved line) of discharge required, All ofthese features contribute to a high rate of material delivery withoutinterruption due to required stopping and repositioning of conveyors asin prior conveyor systems.

Controllable means to traverse the frame 64-, 65 of the swivel hopper SHalong the upper conveyor UC comprises the motor M4 (-FIG. 2) on theframe, and suitable stepdown gearing terminating in a sprocket 82meshing with a chain 84 and located in a channel 86 of the right sideframe 34 shown in FIG. 6. Similarly the motor M4 for traversing thelower conveyor LC relative to the upper conveyor UC drives a sprocket 88through suitable stepdown gearing meshing with a chain 90 contained in achannel'92 of the right side frame 34a. The ends of the chains 84 and 90are secured to the upper and lower conveyors respectively adjacent theirends whereby rotation of the sprockets 82 and 88 result in their travelalong the chains in either desired direction, the motors M5 and M4 beingof reversible type for this purpose.

The supply conveyor SC has a lower and upper portions 94 and 96 whichare jointed together in any suitable manner as indicated at 98 in FIG. 1so that the upper portion 96 may be Ievelized or adjusted to a positionat right angles to the axis 22 as shown in FIGS. 1 and 2. The outriggers18 can of course be operated to attain true vertical for the axis 22.The terminal end of the conveyor SC is provided with a discharge head100 to which it is secured, and the head has an annular lower portion101 to fit inside the cylindrical upper portion 68a of the chute 68 forrelative rotation about the axis of the annular and cylindrical portionsjust mentioned. On the lower end of the lower portion 94 of the supplyconveyor SC caster wheels 102 are mounted as shown in FIGS. 1 and12,.the caster yokes therefor being shown at 104' pivoted as at 106 to across frame member 108. Normally the wheels 102 are free to caster, butmaybe locked as by lockpins 110 for transport as will hereinafter bedescribed.

The outer end of the lower conveyor LC carries a discharge boot 112discharging into a funnel 114 to which atremie 116 is secured. Themanner of securement is releasable, and may comprise by way of example aclamp band formed of two halves 118 and 120 normally held together byrelease links 122 which may be in the form of threaded rods pivoted at124 to the clamp band half 118 and extending other type slots U- shapedears 126 and 128 on the band halves-118 and 120 respectively as shown inFIG. 11. Connecting links 132 are loosely pivoted to the outer ends ofthe release links 122 and are pivoted to bellcranks 134 connected bychains 136 to the frame of the lower conveyor LC. The tremie 116 may beformed of a plastic tube for material delivery purposes and used asshown, for instance in FIG. 1 to fill a column form 140, a floor form asat 142, a wall form (not illustrated), or a dam wall form or the like.FIG. 1 also illustrates a dump truck 144 delivering materials to thesupply conveyor SC.

The funnel 114 is suspended by a pair of springs 138 from the lowerconveyor LC and together with the chains 136, bellcranks 134, links 132and release 'links 122, an automatic release means for the tremie 116 isprovided in response to excessive loading thereof as will hereinafterappear.

Before the tremie 116 releases however, a limit switch LS showndiagrammatically in FIG. is actuated for the purpose of closing acircuit through an adjacently located waring siren 146 and opening thecircuit of all three conveyor motors M1, M2 and M3. Thus the siren (orother type of warning device) alerts the men below the conveyor andguiding the tremie for distributing the concrete, that an overloadcondition is imminent and the tremie may release. At the same time theentire conveyor is automatically shut down, quite often before actualrelease of the tremie occurs. Accordingly the men can relieve theoverload condition and recondition the tremie release for properautomatic operation again. FIG. I0 also shows, in simplifieddiagrammatic form, part of the control panel 152 in the cab of thevehicle WV to show two terminals at the left for current supply to thesiren 146 and the motc M1, M2 and M3, and three terminals to the rightfor the in dividual controls for the motors M1, M2 and M3 by theoperator in thecab. Since electric circuitry is well known in the artbut forms no part of my present invention, I have not illus trated thedetails of a type of circuit suitable for the signal devices and motorssuch as disclosed in FIG. 10.

PRACTICAL OPERATION In the operation of my boom mounted conveying means,the extensible boom of the wheeled vehicle WV and the lower conveyor LCmay be retracted to the position shown in FIG. 15 for transport of thevehicle, and the lockpins may be inserted for locking the casteredwheels 102 against castering whereupon the vehicle may be used totransport the entire conveyor system from one location to another, thewheels 102 trailing behind the vehicle wheels 16 in an obvious manner.

At the new job location the outriggers 18 can be extended and adjustedfor verticalizing the column centerline 22 whereupon the boom and lowerconveyor can be extended as desired, the lockpins 110 removed and thelower end of the supply conveyor SC swung around to any convenientlocation for receiving materials from the dump truck 144. The joint at98 between the lowerand upper portions 94 and 96 of the supplyconveyorcan be adjusted for levelizing the upper portion 96 to permitpositioning the lower reception end of the supply conveyor withoutbinding action during the swiveling of the connection between the supplyconveyor and the swivel hopper SH. The motors M5 and M6 are actuated foraligning the axis of the conveyor and hopper'parts 101 and 680 withtheaxis22. I

Materials may now flow from the dump truck I44 onto the supply conveyorSC and will be delivered to the upper conveyor UC and' it will deliverthe materials to the lower conveyor LC for discharge through the tremie116 as into the column form shown in FIG. 1. As the materials accumulatein the form the extensible boom B1, B2, B3 may' be elevated and themotors M5 and M6 suitably actuated to retain the axis of the swivellyrelated parts 101 and 68a aligned with the axis 22.

When a horizontally elongated form is to be filled with concrete such asa wall form or the like, the boom can be swung from side to side, andthe boom and lower conveyor retracted or extended as required toproperly discharge into the form from one end thereof to the other, thenelevated for discharge along the form in the opposite direction, allwhile the concrete is being continuously supplied and discharged at thehigh speeds disclosed in the above mentioned Oury patents. Accordingly,my boom mounted conveyor SySlfih makes possible the placement of acomplete load from t'- supply truck without interruption, thus savingvaluable time In the operation of form filling or comparable operationssuch as the placement of granular material and the like.

By the use ofa novel supporting system such as I disclose for theconveyors with respect to the extensible boom, a maximum range ofadjustment is had, together with proper distribution of supporting meansto counteract cantilever action. By the use of the three quickdisconnect means disclosed, a minimum of time is involved in removingthe conveyor system from the wheeled vehicle whereupon it can than beused between conveyor operations as a crane in its normal capacity. I

I claim as my invention:

1. Apparatus for conveying concrete, said apparatus comprising acrane-type vehicle having a boom-supporting column with a substantiallyvertical axis, a load-supporting cantilever boom mounted on said columnand having first and second portions, said first boom portion beingmounted for rotation and angular elevation with respect to said vehicleaxis, said second boom portion being extensively carried by said firstboom portion, endless-belt conveyor means having a fixed section and amoving section wholly supported by said boom,

first, second and third support means cooperating to support saidconveyor means on said boom, and quick disconnect means provided forsaid first, second and third supporting means so that said conveyormeans is readily connected to or disconnected from said boom.

2. Means for conveying concrete comprising:

a crane-type wheeled vehicle;

an extensible, load supporting, cantilever boom pivotally mounted forrotation and angular elevation on said vehicle and comprisingtelescoping sections;

extensible outrigger means mounted on said vehicle for stability whenthe boom is in operation;

a first conveyor mounted on said boom;

a second conveyor mounted on said boom above the boom and beneath saidfirst conveyor, said second conveyor being longitudinally movable withone telescoping section and having its inner end disposed with respectto the outer end of said first conveyor to receive concrete therefrom;

each of said conveyors being wholly supported by said boom andcomprising a frame with an endless belt mounted thereon;

a first support extending upwardly from said boom for the inner end ofsaid first conveyor;

a second support on said boom spaced outwardly from said first supportfor at least partially supporting the outer end of said first conveyor;

a third support for said second conveyor mounted on a movabletelescoping section of said boom;

additional support means including track and roller means extendingbetween the frames of said first and second conveyors to further supportsaid second conveyor by suspension from said first conveyor and topermit said longitudinal movement of said second conveyor with respectto said first conveyor;

hopper means mounted on and above said first conveyor;

and

a supply conveyor associated with said first conveyor for deliveringconcrete into said hopper means.

3. Means for conveying concrete in accordance with claim 2 wherein saidboom has a nonextensible portion, and first and second movabletelescoping sections, said first support being positioned adjacent theinner end of said nonextcnsihlc boom portion and the inner end of saidfirst conveyor and connecting them together, said second supportcomprising three supporting elements, a first supporting element at theouter end of said first extensible boom portion and coacting with thetrack means of said second conveyor, and the second and third onespositioned inwardly and outwardly of said first supporting element, oneof said second and third ones having coaction with the track means ofsaid first conveyor and the other thereof having coaction with the trackmeans of said second conveyor, and said third support being located atthe outer end of said second telescoping section and having coactionwith the track means of said second conveyor.

4. Means for conveying concrete in accordance with claim I wherein eachof said first, second and third supports has quickly disconnect meansfor said conveying means with respect to said nonextensible andtelescoping sections of said boom.

5. Means for conveying concrete in accordance with claim 2 wherein saidsupply conveyor has an intake end adjacent ground level, and an elevateddischarge end at said hopper means.

6. Means for conveying concrete in accordance with claim 5 wherein thelower intake end of said supply conveyor is provided with caster wheelsfor transport of said concrete conveyor by operation ofsaid wheeledvehicle.

7. Means for conveying concrete in accordance with claim 6 wherein meansis provided for locking said caster wheels against castering during suchtransport.

8. Means for conveying concrete in accordance with claim 2 wherein eachof said first, second and third supports has a quickly disconnectableconnection with said boom.

9. cans for conveying concrete comprising:

a crane-type wheeled vehicle having outriggers;

an extensible load-supporting, cantilever boom pivotally mounted forrotation and angular elevation on said vehicle and comprisingtelescoping sections;

a first belt conveyor mounted on and above said boom;

a second belt conveyor, spaced intermediate said boom and said firstconveyor, supported for longitudinal movement by supports extendingupwardly from the extensible telescoping sections of said boom anddownwardly from said first conveyor, said second conveyor being coupledto one of said extensible telescoping sections to move therewith;

a hopper mounted on and above said first conveyor;

a supply conveyor having its discharge end disposed above said hopperand its intake end adjacent ground level; and

funnel means at the discharge end of said second conveyor for directingthe flow of concrete from the conveyor.

10. Means for conveying concrete in accordance with claim 9 wherein saidhopper is pivotally mounted for maintaining a vertical attitudeindependently of the angle of elevation of the boom and the firstconveyor on which the hopper is mounted.

ll. Means for conveying concrete in accordance with claim 10 whereinsaid hopper mounting carries rollers for longitudinal movement of saidhopper along said first conveyor.

[2. Means for conveying concrete in accordance with claim [0 whereinsaid hopper pivotal mounting includes a carriage support, wheels for thecarriage and a track extending longitu dinally of said first conveyor onwhich said wheels ride.

13. Means for conveying concrete in accordance with claim 9 wherein atremie extends downwardly from said funnel and supporting means isprovided for said tremie which releases the tremie in response to anaccumulation of concrete in said tremie reaching a predetermined weight.

14. The concrete conveyor of claim 9 in which the telescoping boomsections have smooth platelike external surfaces.

1. Apparatus for conveying concrete, said apparatus comprising a crane-type vehicle having a boom-supporting column with a substantially vertical axis, a load-supporting cantilever boom mounted on said column and having first and second portions, said first boom portion being mounted for rotation and angular elevation with respect to said vehicle axis, said second boom portion being extensively carried by said first boom portion, endless-belt conveyor means having a fixed section and a moving section wholly supported by said boom, first, second and third support means cooperating to support said conveyor means on said boom, and quick disconnect means provided for said first, second and third supporting means so that said conveyor means is readily connected to or disconnected from said boom.
 2. Means for conveying concrete comprising: a crane-type wheeled vehicle; an extensible, load supporting, cantilever boom pivotally mounted for rotation and angular elevation on said vehicle and comprising telescoping sections; extensible outrigger means mounted on said vehicle for stability when the boom is in operation; a first conveyor mounted on said boom; a second conveyor mounted on said boom above the boom and beneath said first conveyor, said second conveyor being longitudinally movable with one telescoping section and having its inner end disposed with respect to the outer end of said first conveyor to receive concrete therefrom; each of said conveyors being wholly supported by said boom and comprising a frame with an endless belt mounted thereon; a first support extending upwardly from said boom for the inner end of said first conveyor; a second support on said boom spaced outwardly from said first support for at least partially supporting the outer end of said first conveyor; a third support for said second conveyor mounted on a movable telescoping section of said boom; additional support means including track and roller means extending between the frames of said first and second conveyors to further support said second conveyor by suspension from said first conveyor and to permit said longitudinal movement of said second conveyor with respect to said first conveyor; hopper means mounted on and above said first conveyor; and a supply conveyor associated with said first conveyor for delivering concrete into said hopper means.
 3. Means for conveying concrete in accordance with claim 2 wherein said boom has a nonextensible portion, and first and second movable teLescoping sections, said first support being positioned adjacent the inner end of said nonextensible boom portion and the inner end of said first conveyor and connecting them together, said second support comprising three supporting elements, a first supporting element at the outer end of said first extensible boom portion and coacting with the track means of said second conveyor, and the second and third ones positioned inwardly and outwardly of said first supporting element, one of said second and third ones having coaction with the track means of said first conveyor and the other thereof having coaction with the track means of said second conveyor, and said third support being located at the outer end of said second telescoping section and having coaction with the track means of said second conveyor.
 4. Means for conveying concrete in accordance with claim 3 wherein each of said first, second and third supports has quickly disconnect means for said conveying means with respect to said nonextensible and telescoping sections of said boom.
 5. Means for conveying concrete in accordance with claim 2 wherein said supply conveyor has an intake end adjacent ground level, and an elevated discharge end at said hopper means.
 6. Means for conveying concrete in accordance with claim 5 wherein the lower intake end of said supply conveyor is provided with caster wheels for transport of said concrete conveyor by operation of said wheeled vehicle.
 7. Means for conveying concrete in accordance with claim 6 wherein means is provided for locking said caster wheels against castering during such transport.
 8. Means for conveying concrete in accordance with claim 2 wherein each of said first, second and third supports has a quickly disconnectable connection with said boom.
 9. Means for conveying concrete comprising: a crane-type wheeled vehicle having outriggers; an extensible load-supporting, cantilever boom pivotally mounted for rotation and angular elevation on said vehicle and comprising telescoping sections; a first belt conveyor mounted on and above said boom; a second belt conveyor, spaced intermediate said boom and said first conveyor, supported for longitudinal movement by supports extending upwardly from the extensible telescoping sections of said boom and downwardly from said first conveyor, said second conveyor being coupled to one of said extensible telescoping sections to move therewith; a hopper mounted on and above said first conveyor; a supply conveyor having its discharge end disposed above said hopper and its intake end adjacent ground level; and funnel means at the discharge end of said second conveyor for directing the flow of concrete from the conveyor.
 10. Means for conveying concrete in accordance with claim 9 wherein said hopper is pivotally mounted for maintaining a vertical attitude independently of the angle of elevation of the boom and the first conveyor on which the hopper is mounted.
 11. Means for conveying concrete in accordance with claim 10 wherein said hopper mounting carries rollers for longitudinal movement of said hopper along said first conveyor.
 12. Means for conveying concrete in accordance with claim 10 wherein said hopper pivotal mounting includes a carriage support, wheels for the carriage and a track extending longitudinally of said first conveyor on which said wheels ride.
 13. Means for conveying concrete in accordance with claim 9 wherein a tremie extends downwardly from said funnel and supporting means is provided for said tremie which releases the tremie in response to an accumulation of concrete in said tremie reaching a predetermined weight.
 14. The concrete conveyor of claim 9 in which the telescoping boom sections have smooth platelike external surfaces. 